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CVE-2026-54397— MISP event editing allows unauthorized assignment to undisclosed sharing groups

Quick assessment

Affected
misp misp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MISP是MISP组织开源的一套开源的软件解决方案。 该产品用于收集、存储、分发、共享网络安全指标,并具有威胁网络安全事件分析和恶意软件分析等功能。 MISP存在授权问题漏洞，该漏洞源于非REST事件编辑路径缺少对分享组的授权验证，可能导致已认证用户利用表单数据操作，将事件分配至未授权的分享组，从而造成分享组名称泄露、事件元数据被修改。

AI Predicted 7.5 Difficulty: Easy EPSS 0.35% · P26

Affected Version Matrix 1

VendorProduct Version RangeStatus
misp misp < 2.5.40 affected
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I. Basic Information for CVE-2026-54397

Vulnerability Information
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Vulnerability Title
MISP event editing allows unauthorized assignment to undisclosed sharing groups
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in MISP’s non-REST event editing path allowed an authenticated user with event edit permissions to manipulate the submitted form data and set an event’s sharing_group_id to a sharing group they were not authorized to use. When distribution was set to sharing group distribution, the non-REST save path accepted the submitted sharing_group_id without performing the same sharing group authorization check enforced by the REST edit path. An attacker could exploit this by tampering with the event edit request and assigning an event to an undisclosed or unauthorized sharing group. This could result in unauthorized use of restricted sharing groups, disclosure of the sharing group name in event listings, and unintended modification of the event’s distribution metadata. The issue is fixed by validating that the selected sharing group can be used by the current user when the sharing group is changed, and by clearing sharing_group_id when the event distribution is not set to sharing group distribution.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:H/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
MISP 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MISP是MISP组织开源的一套开源的软件解决方案。 该产品用于收集、存储、分发、共享网络安全指标,并具有威胁网络安全事件分析和恶意软件分析等功能。 MISP存在授权问题漏洞，该漏洞源于非REST事件编辑路径缺少对分享组的授权验证，可能导致已认证用户利用表单数据操作，将事件分配至未授权的分享组，从而造成分享组名称泄露、事件元数据被修改。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
misp misp 0 ~ 2.5.40 -

II. Public POCs for CVE-2026-54397

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III. Intelligence Information for CVE-2026-54397

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Patches & Fixes for CVE-2026-54397 (1)

Same Patch Batch · misp · 2026-06-12 · 12 CVEs total

CVE-2026-54358 MISP organization administrators can target site administrator accounts for password reset
CVE-2026-54362 MISP template builder exposes non-visible custom galaxies across organisations
CVE-2026-54359 MISP automation endpoints may be exposed to CSRF when Sec-Fetch-Site protection is disable
CVE-2026-54398 MISP object edit authorization bypass allows unauthorized sharing group assignment
CVE-2026-54396 MISP AuthKey edit endpoint allows authenticated user email enumeration
CVE-2026-54394 MISP organisation logo path traversal allows retrieval of arbitrary PNG/SVG files
CVE-2026-54357 MISP improper authorization allows organization administrators to modify site administrato
CVE-2026-54393 MISP Overmind theme stored XSS via unvalidated homepage setting
CVE-2026-54395 MISP UiBeta event index reflected XSS in advanced filter popup
CVE-2026-54360 MISP sharing group creation mass assignment allows unauthorized takeover of existing shari
CVE-2026-54361 MISP mass assignment vulnerabilities allow unauthorized modification of ownership and dele

IV. Related Vulnerabilities

Same product: misp
Same vendor: misp
Same weakness: CWE-863

V. Comments for CVE-2026-54397

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